I'm about 6'2" as well, but I much prefer a bike that fits. Something around 19 or 20 inches would be great. I rode a 15 inch frame for a short period of time (it was a dirt jumper) and it felt incredibly cramped. I suppose it all boils down to your riding style.
I just purchased a Salsa Juan Solo ss, but I was looking at the Mia. The Mia looks like a great bike. I was hard pressed to choose between the Redline Monocog and the IRO Mia. In the end, I only went with the Salsa because I got a good deal on it.